Connection fitting for automatic transmission fluid pipes - WF58.50-P-2020-01A

All engines 

Shop-make double threaded union (01) for short-circuiting ATF feed and return pipes, e.g. from DIN parts.

Diameter of thread M14 x 1.5.

Fig 1: Identifying Shop-Make Double Threaded Union

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.